Cheramus Bate, 1888

Ngoc-Ho, Nguyen, 2005, Thalassinidea (Crustacea, Decapoda) from French Polynesia, Zoosystema 27 (1), pp. 47-83 : 77

Genus Cheramus Bate, 1888

Cheramus sibogae (de Man, 1905) ( Fig. 15 )

Callianassa Sibogae de Man, 1905: 613 ; 1928b: 27, 98.

Callianassa (? Cheramus ) Sibogae – de Man 1928b: 124, pl. 11, fig. 17-17e.

Callianassa s ibogae – Ngoc-Ho 1994: 54, fig. 3. — Sakai 1999: 52.

Cheramus sibogae – Tudge et al. 2000: 145.

TYPE MATERIAL. — Holotype: Indonesia, Java Anchorage (7°46’S, 114°30’E), Siboga Expedition , stn 5, 300 m, ( ZMA De 102 439).

MATERIAL EXAMINED. — French Polynesia. Raiatea Is., Society, FV Marara , stn D 91, 16°43.17’S,

Thalassinidea (Crustacea, Decapoda ) from French Polynesia coll., 1, cl. 7.5 mm, tl. 23.5 mm, both Mxp3 and one P1 missing ( MNHN Th 1434).

DISTRIBUTION. — Java Anchorage, Indonesia (de Man 1905); northwest shelf, Australia (Ngoc-Ho 1994); Raiatea Is., Society, French Polynesia.

REMARKS

This species is assigned to the genus Cheramus , following Tudge et al. (2000) due to the presence of a rostral spine, subterminal lateral corneas, pereopod 1 without meral hook, pleopods 3-5 slender with digitiform appendix interna, elongate uropod exopod (though length is not twice width, as defined by Manning & Felder 1991).

The absence of both Mpx3 as well as one P1 casts a little uncertainty over the identification of the present specimen. It nevertheless agrees well with the holotype of C. sibogae (see de Man 1928b: 124, pl. 11, fig. 17-17e) and the material from Australia studied by Ngoc-Ho (1994: 54, fig. 3) in the acute and slightly upturned rostrum ( Fig. 15A, B ), the form of eyestalks, the A1 and A2 ( Fig. 15A ), the (presumably) minor P1 (F i g. 1 5C), a n d t h e t e l s o n a n d u r o p o d s ( Fig. 15K ). The P2-P5 ( Fig. 15 D-G) are all unarmed and the P3 propodus is not expanded ventrally, lacking a posterior lobe.

Female Plp1 ( Fig. 15H ) is uniramous, Plp2 ( Fig. 15I ) is biramous, Plp3-5 ( Fig. 15J ) with slender rami and digitiform appendix interna.

Figures

FIG. 15. — Cheramus sibogae (de Man, 1905), Raiatea, (MNHN Th 1434); A, B, anterior part of carapace in dorsal and lateral view; C-G, pereopod 1-5; H, I, pleopod 1 and 2; J, pleopod 3; K, telson and uropods. Scale bars: 1 mm.